Blowpipe.



M. K. DUNHAM.

BLOWPIPE. APPLICATION FILED DEC. 31, 1909.

2 M, 1 m J m/ W W m 0 Z 70 nular p li l nil nil) mil application filed Bccemse" To all whom it may concern:

Be it known that l, Mnnnominn K. DUN- HAM, a citizen of the United States, residing; at Brooklinc, county of Norfolk, and State of lllassachusetts, have invented an Improvement in Blowpipes, of which the following description, in connection with the accompanying drawing, '7 a -,;specification, like characters on the drawin representing like parts.

This invention relates to blow pipes and cs wcially to blow pipes designed for a utogc nous weldin 'l The objectof the invention is to provide a blow pipe of this character so constructed as to eliminate all danger of a blow haul; and also to provides blow piposoarranged that the head and handle will be kept cool while the device is in operation.

The features wherein the invention resides will be hereinafter described and then pointed out in the appended claims.

Referring now to the drawings wherein it. have shown one embodiment of my invention, Figure 1. is a sectionalview ot a device embodying the invention; Fig. Q is a top plan View of the nozzle detached; Fig. is a bottom plan View of the head with the nozzle detached.

The blow pipe herein illustrated is designed for generating an OXY-EKOMEYlQHQ flame, although it is capable of use in generating an any-hydrogen or any other similar flame commonly used for autogenous wcldino.

My improved blow pipe comprises a head 3 provided with an annular chamber 4 into which oxygen is delivered from an oxygen supply pipe 5. This chamber has extending therefrom one or more ducts 6 which lead down through the head and terminate in the lower end thereof in an angroove 7 which forms a communica- Sec-uredto the lower end of the head is a removable nozzle 8 which contains a mixing chamber 9 in which the two gases are tion between these duct-s.

mixed, said mixing chamber terminating at the-lower end of the nozzle in a discharge port 10 through which the mixed gases are discharged and at which the flame is generated. This nozzle is'shown as having a screw-threaded extension 11 which screws into a screw-threaded recess formed in the-lower end'o'fthe head 3. The nozzle is provided with one or more ports 12 which lead into the mixingchainber 9 slightly below the discharge end of the'ports 132, this nipple or nozzle being provided with a contra port i l which communicates with a port port 15 has comn'iunication with a supply pipe 16 through which the acetylene, hydrogen i.)r--. o'liher similar gas is delivered to the blow pipe. llhen the blow pipe is in operation, the gases delivered from the ducts 14: and 12 are mixed together in the mixing chamber and the gas mixture is burned as it is discharged from the port 10 in aisual way.

in order to avoid all danger of a blow back, 1 have eliminated entirely any en-.

larged' chamber in the head for receivlng the acetylene, hydrogen, or other similar gas, and i connect the port or duct 15 with the pipe 16 through a small duct 17. W'ith this construction it will be seenv that the head contains at no time any ofiacetylene, hydrogen, or similar gas, than is confined in the diicl's 15 and 17, and as these ducts are comparatively small, it will be impossible for the gas to become ignited in them, or for the lame to flash 16. Each of the pipes 5 and i6 is preferably provided with pet-cocks l9 by which the supply of gas can be controlled.

I propose to supply the blow pipe under pressur rather than to have the acetylene, hydrogen, or similar gas, drawn into iliOJlllXlI'lfi chamber by the discharge of the oxygen, and therefore it is possible for me. to deliver the acetylene, hydrogen, etc, through the central port 14: and to deliver the oxygen through the-surrounding ports 1 The oxygen is taken from a tank containing oxygen under a considerable pressure and is delivered from the blow pipe at a considerably reduced pressure.- There will, therefore, be considerable expansion of the oxygen after it passes the pet-cock 19, and this expansion or" the gas in the pipe 5 and the annular passage l will have a cooling or refrigerating ell'ect. "blow pipe is designed to make use of th s cooling or refrigerating ell'ect for keeping li formed in the head. Saidlarger volume back through them to the body of gas in the pipe;-

both of the gases to i'ect from the expansion or the oxygen to 'lzeep the heed cool enough so that it can be used eontinuonslv for welding or other pur poses ioiitpiunging it in the water at.

intervals as it is necessary to do with the ordinary blow pipe. v

The object of my invention to make the nozzle 8 removable so that nozzles of differentsizes and shapes may be used according to the character of the work being done.

The head is provided with clean-out apertures 21, 22 through which the ducts 15 and 17 can be cleaned, and these apertures are nor nelly closed by plugs end I propohe' to provide av filter for the acetylene gas, and this is conveniently located in the pipe 18. As shown, said pipe has therein av body of filtering material :25,-snch as asbestos.

wool which is confined between two perforated disks that are shown as connected by a, rod 27.

In order to provide a convenient handle by which the blow pipe may be manipuleted, I have secured on the two pipes 5 and 16 two disks 28 which ereconnected by a shell 29 that forms a hand-piece by which the device may he gripped.

I have shown herein one embodiment only of my invention.

"Having fully described my invention, whet I as new and desire to secure by Letters Patent is i. in it blew pipe, the combination with it ccdy having it duct extending centrally theret-hrough, or" a nozzle reni ovebly secured to body and provided with a burner opening and e mixing chamber leading thereto said nozzle being formed with a. niyple 13 which projects into the rear end of the mixing chamber and is provided with aduct communicating with the duct in the body, said body also having an annular chamber-surrounding the duct therethrough, but having no communication fherewith and said nozzle having a plurality of redially-arranged ports leading from said on nnlar chamber-into the mixing chamber and opening thereinto in an inwardly and down weirdly-inclined direction at 3. pointadjacentthe end of the nipple.

2. A blow pipe comprising a head end a nozzle reniovably secured thereto. said nozzle having a mixing chamber therein which terminates at a burner o-enin at the end thereof. said heedhaving an oxygen-receiving chamber, and the nozzle having one or inore ducts leading from said oxygen-receiving chamber laterally into the mixing chainher, said nozzle also having a nipple extending centrally into the mixing chamber and terminating. at a pointbetween said ducts and the end of the head and provided with a duct or passageway which leads into said mixing chamber, a pipe communicating with said duct or passageway, and an oxygen pipe leading into the oxygeirreceiving chamber-end situated between the burner opening and the first-named pipe.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

MELBOURNE K. DURHAM; Witnesses Lents C. SMITH, THOMAS J. DRUMMOND. 

